Officials in the Michigan Department of Education want to determine why student performance varies across school districts in the state. Department officials ask their chief statistician to run a regression analysis where the average district pass rate on the state-mandated standardized skills test is the dependent variable (TEST). The independent variables are the average teacher salary per school district (TSAL), the average class size (CLSIZE), and the average district daily attendance rate (ATTEND). What can the chief statistician report to her supervisors after running the analysis?